Reamer and burnishing tool



Dec. 7 1926. 1,509,632

, A. REED REAMER AND BURNISHING TOOL Filed Oct. 8, 1923i Patented Dec. 7, 1926.

ASBURY REED, OF LOS ANGELES, CALIFORNIA, ASSIGNOR TO UNITED STATES BEAMER AND TOOL CORPORATION, OF LOS ANGELES, CALIFORNIA, A CORPORATION 0F CALIFORNIA.

Application led October 8, 1923.

This invention relates to a reamer and burnishing tool.

An object is to provide a tool including a guide in the form of a sleeve consisting of a number of longitudinal, independent and separable pieces, and which form a support for the work and tool and is capable of expansion and contract-ion to it a bore to be scraped or reamed and burnished. An object is to provide a burnishing and scraping tool that will operate to effectively, quickly and accurately work to a flneness of one-half of one-thousandths of an inch, more or less, and which will operate to burnish to a mirror iinish.

A further object is to provide a scraping or cutting and burnishing tool including a sectional or se 'mental shell, sleeve or shroud or burnis ing jacketthat is capable of being adjusted so as to form a substantially cylindrical, peripheral surface that may snugly bear and rub upon the surface to be treated, and an object, in this connection, is to provide a shell, sleeve or jacket in which the sections are relatively separate from each other so that they can be removed from a central mandrel readily, without necessitating an endwise or longitudinal shifting of the sleeve or shell from the mandrel.

Another object is to provide a burnishing and scraping reamer including a' sleeve or shell formed of sections which are independently removable and which may be concurrently expanded while maintaining a cylindrical, peripheral form while they are mounted on the mandrel; in this connection a further object is to provide a burnishing and scraping reamer including an eifective cutting or scraping means which is adjustable independently of the burnishing means upon the mandrel.

Other objects and advantages will be made manifest in the following specification of embodiments of the invention illustrated in the accompanying drawings, wherein:

Figure 1 is a side elevation of a form of the tool.

Fig. 2 is a central, longitudinal section of the same.

Fig. 3 isa perspective' of the mandrel of Figure 1.

Serial No. 667,304.

Fig. is a perspective of a portion of a mandrel having fiat expansion faces for shell or sleeve segments.

Fig. 6 shows a fragment of a modified form of shell segment.

In Figures 1 to 4 inclusive there is illustrated a scraping and polishing reamer which includes a central mandrel having a longitudinally tapering body 2, one end of which is iiattened as at 3 to provide for effective holding of the tool when in operation. One end of the mandrel is provided with threads 4 of a suitable pitch to receive the clamping ring 4a, and the opposite end is provided with a threaded portion 5 receiving a clamping collar 6 and receiving coordinate clamping collars 7 and 8. The mandrel 2 is provided along one side with aV longitudinally extending channel or slot 9, and in this there is mounted Jfor longi tudinal movement a scraper or cutting blade .10, having one inclined edge 10GL complementary to the inclined bottom of the slot 9. The outer, eifective edge 10" of the cutter blade is designed to remain parallel `with the axis of the mandrel as the cutter blade may be shifted in either direction along the slot 9 in the mandrel. To effect this shifting the cutter Vblade is provided; with an outwardly extending lug l0c disposed between the respective clamping rings 7 and 8 threaded on the shaft 5 of the mandrel. It will be seen that the two rings 7 and 8 serve to shift and to lock the cutter 10 in the desired position; sliding the cutter 10 in one direction, as up the inclined bottom of the slot 9. shifts the cutter 10 outwardly, while movement in the opposite direction enables the cutter to be shifted inwardly.

An important feature of this invention includes means forming a shell, shroud or jacket made up of independent sections 11 which are adapted to be assembled around and upon the mandrel 2 and securely clamped in position with their outer faces in a common circle and therefore forming a cylinder. The sections 11 are tapered in thickness and have their inner facesconically concaved. The outer faces of the sections ll are cylindrically convex. These independent sections are adapted to be expanded or contracted on the mandrel to a degree of extreme accuracy for burnishing and roaming purposes.

In Figure 3 the mandrel 2 is shown as of conical form and in such case in the inner faces of thesections or segments l1 will be concave, at 11a, The segments are of substantially oblong form in plan as shown in Figure l, and have bevelled, convergent ends lll presented to complementary bevelled end faces of the clamp rings la and 6 so that the several segments ll, when assembld upon the tapering mandrel 2 may be uniformly adjusted longitudinally on the mandrel and then firmly clamped in a position according to the desired effective diameter of the cylinder formed by ,the sleeve or jacket consisting of the segments or sections 1l.

Any suitable, means may be employed to hold the segments 11 against undue lateral play, and suoli means may consist of rigid side, guide, longitudinally extending shoulders 2') formed or provided on the tapering body of the mandrel 2 and between or against which shoulders the side edges of the sleeve segments may rest.

A. simple and practical form of mandrel is shown in Figure 5 in which the tapering body, instead of being conical, is substantially in the form of a frustum of a pyramid. That is, the tapered body is provided with any suitable number of longitudinal flat faces 2C vupon which may bear contiguous flat faces of' segments otherwise of the type shown in Figure li. This form of construction is very desirable for the reason that when the segment-s il have inner flat faces they Will be supported upon tho opposed flat faces 2C of the pyramidal reamer body. The sections or segments ll applied on the pyramidal r amer body may be retained against lateral movement in any suitable manner as for instance by the longitudinal edges 2d of longitudinal recesses Llc which may bc formed in the llat faces of the body; the edges 2 heilig engaged by complementary shoulders il of 'the segments extending along the inner faces of the segments 1l, Figure G.

The sectional sleeve, shell or shroud, forms essentially an expandable guide which, in its sutiicientiy contracted position, can be entered :into the bore hole of Whatever part it may be intended to ream and burnish and then the sleeve is suliiciently expanded to slightly circumferentially bear upon and rub against the surface of the bore so that when the tooi andA the Work are relatively rotated, the one steadies and supports the other and therefore yentirely prevents any relative vibration. lifter the guide and `support,'con sist-ing of the sectional, expanding sleevey has been snugly fitted to the desired degree of friction and resistance, the cutter is then expanded to a position so as to he effective to scrape or cut the surface of the bore when the Work and the tool are relatively rot-ated. It will be seen that the snug lit of the guideforming, expandable, sectional sleeve or shell forms a firm carrying means for the tool and chatteiI of the tool `and work entirely overcome.

lifter an initial scraping or cutting operaL tion has been completed to the desired degree, then the expandable guide is again adjusted to increase its effective diameter and thus take up the play and can be made to bear and rub upon the bore surface. This inode of operation or successive adjustment of guide shell and cutter is repeated until the desired iinished dimension obtained, and then the cutter may be sufficiently rotracted to permit the rotation of the guide shell while it is bearing snugly on the bore surface to effect an ultimate high burnish or polish of the surface.

Further embodiments, modifications and variations may be resorted to Within the principle of the invention.

lVhatis claimed is:

l. In a burnishing and scraping rea-mer, a mandrel, longitudinal scraping means adj ustably mounted on the mandrel for expansion and retraction, a shell mounted o n said mandrel and consisting of independently applicable and removable, longitudinally extending segments having curved, outer, effective burnishing faces, and means for securing the sectional shell in various positions of adjustment along the mandrel.

2. A scraping and burnishing reainer including aV mandrel having a tapered body portion, a sleeve including a plurality of segments and being longitudinally adjustable along said tapered body portion whereby to he expanded or retracted, means for clamping the shell segments in a desired position along the tapered body portion, a longitudinally extending, adjustable cutter member mounted upon the reamer body and being adapted to project beyond the mounted shell, and means for securing the cutter member in adjusted position; the shell segments having convergently bevelled end faces and said clamping 'means including rings with end faces bevelled complementary to the end faces of the shell sections whereby to hold the segments in position.

3. A scraping and burnishing reamer comprising a mandrel, a shell formed of a plurality of independent segments mounted. upon said mandrel, means for expanding girl or contracting said shell upon said mandrel, l

a cutter adjustably mounted upon said mandrel adapted to be projected outwardly from said shell, and means for adjusting' said cutter independently of said shell.

Ll. A scraping and burnishing reamer comprising a tapered mandrel, a shell formed of a plurality of independent segments longitudinally slidable upon said mandrel, clamping collars for holding said segments upon said mandrel in longitudinally adjusted position thereon, a cutter adapted to be projected outwardly from said shell, and means for adjusting said cutter independently of said shell.

5. A scraping and burnishing `reamer comprising la mandrel, a shell formed of a plurality of independent segments mounted upon-said mandrel, means for expanding or contracting said shell upon said mandrel, a cutter adjustably mounted upon said mandrel ladapted to be projected outwardly from said shell, and means Jfor adjusting said cutter independently of said shell, there being portions projecting from said mandrel between said segments for preventing rotary movement of said segments upon said mandrel.

6. A scraping and burnishing reamer comprising a tapered mandrel, a shell formed of a plurality of independent segments longitudinally slidable upon said mandrel, collars longitudinally adjustable upon said mandrel for forcing said segments in either direction thereon thereby causing the expansion or contraction of said shell, and a cutter independently adjustable upon said mandrel adapted to be projected outwardly from said shell or to be Withdrawn therewithin.

7 A scraping and burnishing reamer comprising a mandrel, lan eXpansible shell mounted upon said mandrel, an inclined groove formed in said mandrel, a cutter slidable in said groove adapted to be projected outwardly from Within said shell, said cutter having an outwardly turned extension, and collars longitudinally adjustable upon said mandrel engaging the opposite sides of said extension for sliding said cutter independently of the shell and holding said cutter in adjusted position.

ASBURY REED. 

